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Thanks very much! One question about the iframe code: Someone told me that the should be a "?rel=0" after the video id. Thus:
<iframe width="550" height="400" src="//www.youtube.com/embed/ECC6l7fAhJQ?rel=0" frameborder="0" allowfullscreen></iframe>
I see that it is not needed in my case, but what does ?rel=0 do?